package com.google.android.zxing;

import java.util.Arrays;
import java.util.List;
import java.util.Vector;
import java.util.regex.Pattern;

import android.content.Intent;
import android.net.Uri;

import com.google.android.zxing.decoding.Intents;
import com.google.zxing.BarcodeFormat;

final class MyDecodeFormatManager {

	  private static final Pattern COMMA_PATTERN = Pattern.compile(",");

	  static final Vector<BarcodeFormat> PRODUCT_FORMATS;
	  static final Vector<BarcodeFormat> ONE_D_FORMATS;
	  static final Vector<BarcodeFormat> QR_CODE_FORMATS;
	  static final Vector<BarcodeFormat> DATA_MATRIX_FORMATS;
	  static {
	    PRODUCT_FORMATS = new Vector<BarcodeFormat>(5);
	    PRODUCT_FORMATS.add(BarcodeFormat.UPC_A);
	    PRODUCT_FORMATS.add(BarcodeFormat.UPC_E);
	    PRODUCT_FORMATS.add(BarcodeFormat.EAN_13);
	    PRODUCT_FORMATS.add(BarcodeFormat.EAN_8);
	    PRODUCT_FORMATS.add(BarcodeFormat.RSS_14);
	    ONE_D_FORMATS = new Vector<BarcodeFormat>(PRODUCT_FORMATS.size() + 4);
	    ONE_D_FORMATS.addAll(PRODUCT_FORMATS);
	    ONE_D_FORMATS.add(BarcodeFormat.CODE_39);
	    ONE_D_FORMATS.add(BarcodeFormat.CODE_93);
	    ONE_D_FORMATS.add(BarcodeFormat.CODE_128);
	    ONE_D_FORMATS.add(BarcodeFormat.ITF);
	    QR_CODE_FORMATS = new Vector<BarcodeFormat>(1);
	    QR_CODE_FORMATS.add(BarcodeFormat.QR_CODE);
	    DATA_MATRIX_FORMATS = new Vector<BarcodeFormat>(1);
	    DATA_MATRIX_FORMATS.add(BarcodeFormat.DATA_MATRIX);
	  }

	  private MyDecodeFormatManager() {}

	  static Vector<BarcodeFormat> parseDecodeFormats(Intent intent) {
	    List<String> scanFormats = null;
	    String scanFormatsString = intent.getStringExtra(Intents.Scan.SCAN_FORMATS);
	    if (scanFormatsString != null) {
	      scanFormats = Arrays.asList(COMMA_PATTERN.split(scanFormatsString));
	    }
	    return parseDecodeFormats(scanFormats, intent.getStringExtra(Intents.Scan.MODE));
	  }

	  static Vector<BarcodeFormat> parseDecodeFormats(Uri inputUri) {
	    List<String> formats = inputUri.getQueryParameters(Intents.Scan.SCAN_FORMATS);
	    if (formats != null && formats.size() == 1 && formats.get(0) != null){
	      formats = Arrays.asList(COMMA_PATTERN.split(formats.get(0)));
	    }
	    return parseDecodeFormats(formats, inputUri.getQueryParameter(Intents.Scan.MODE));
	  }

	  private static Vector<BarcodeFormat> parseDecodeFormats(Iterable<String> scanFormats,
	                                                          String decodeMode) {
	    if (scanFormats != null) {
	      Vector<BarcodeFormat> formats = new Vector<BarcodeFormat>();
	      try {
	        for (String format : scanFormats) {
	          formats.add(BarcodeFormat.valueOf(format));
	        }
	        return formats;
	      } catch (IllegalArgumentException iae) {
	        // ignore it then
	      }
	    }
	    if (decodeMode != null) {
	      if (Intents.Scan.PRODUCT_MODE.equals(decodeMode)) {
	        return PRODUCT_FORMATS;
	      }
	      if (Intents.Scan.QR_CODE_MODE.equals(decodeMode)) {
	        return QR_CODE_FORMATS;
	      }
	      if (Intents.Scan.DATA_MATRIX_MODE.equals(decodeMode)) {
	        return DATA_MATRIX_FORMATS;
	      }
	      if (Intents.Scan.ONE_D_MODE.equals(decodeMode)) {
	        return ONE_D_FORMATS;
	      }
	    }
	    return null;
	  }

	}